The study on the control of nonlinear distortion of moving-coil loudspeakers
Date Issued
2015
Date
2015
Author(s)
Yang, Shang-Xian
Abstract
This paper focuses on the application of feedback linearization control for moving-coil loudspeaker to reduce the output distortion. Signal distortion caused by loudspeaker nonlinearities can be reduced with inverse dynamic processor. First of all, the loudspeaker system separates into three parts, i.e. electrical, mechanical and radiation components, to build the models. Then the system equations are used to investigate the effect of the nonlinear parameters on the output of the loudspeaker. The nonlinearity will cause unwanted harmonics in the response of loudspeaker. To reduce this nonlinear effect, a feedback linearization method from nonlinear control theory is applied to the nonlinear loudspeaker model. Numerical simulation reveals that the feedback linearization method can reduce the harmonic signals effectively. Finally, the present approach is applied on the nonlinear control of the real loudspeaker. The results show that the THD (total harmonic distortion) of the output response reduced significantly in the cases of loudspeaker and closed-box loudspeaker system.
Subjects
moving-coil loudspeaker
feedback linearization
nonlinear control
harmonic distortion
electro-mechano-acoustic analogous circuits
Type
thesis
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